randomly choose an element from each row in a matrix if it was equal to one

Question

kurdistan mohsin 2022-5-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1727530-randomly-choose-an-element-from-each-row-in-a-matrix-if-it-was-equal-to-one

编辑： Torsten 2022-5-26

i have the below matrix and i want to choose randomly one element from each row but only for the elements values equal to one and then save it in another matrix which will have the results (each row will have only one element equal to 1 ), anyone can help?

D=   1     1     0     1     1
   1     1     1     1
   0     0     0     0
   1     1     1     1
   0     1     0     1
   0     1     0     0
   0     0     0     0
   0     1     0     0
   0     0     0     0
   1     0     0     0

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Torsten 2022-5-26

And what if there is no 1 in the respective row ?

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Answer 1

Torsten 2022-5-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1727530-randomly-choose-an-element-from-each-row-in-a-matrix-if-it-was-equal-to-one#answer_972090

编辑：Torsten 2022-5-26

在 MATLAB Online 中打开

You mean

D= [1     1     0     1     1
    1     1     1     1     1
    0     0     0     0     0
    1     1     1     1     1
    1     0     1     0     1
    0     0     1     0     0
    0     0     0     0     0
    0     0     1     0     0
    0     0     0     0     0
    0     1     0     0     0];
[N,M] = size(D);
DD = zeros(size(D));
for i = 1:N   
  idx = find(D(i,:)==1)
  n = numel(idx);
  if n ~= 0 
    in = randi(n);
    DD(i,idx(in)) = 1.0;
  end
end